Amperometric enzyme electrodes for the determination of volatile alcohols in the headspace above fruit and vegetable juices

Schlangen, Claudia; Hämmerle, Martin; Moos, Ralf

doi:10.1007/s00604-012-0867-5

Cited by 9 publications

(3 citation statements)

References 21 publications

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“…Acetaldehyde concentrations have been reported to increase as a result of ripening and maturation processes during storage of harvested fruits such as fig fruit (Bouzo et al ., ), tomato (Farneti et al ., ), apple (Lee et al ., ; Ting et al ., ) and avocado (Obenland et al ., ) and vegetables such as broccoli, cauliflower, romaine lettuce, spinach, sugar snap peas (Cantwell et al ., ) and cabbage (Plestenjak et al ., ). Changes in methanol content have been reported previously in berry fruits (Boschetti et al ., ), combination of fruits and vegetable juices (Schlangen et al ., ) and citrus fruits (Yun et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Monitoring colour, volatiles in the headspace and enzyme activity to assess the quality of broccoli florets (Brassica oleracea L. italica cv. Bellstar and Legacy) during postharvest storage

Raseetha

Oey

Burritt

et al. 2013

Int J of Food Sci Tech

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Summary The research objective was to study whether volatile organic compounds released in the headspace could be used to assess the broccoli quality (Brassica oleracea L. italica cv. Bellstar and Legacy) during postharvest storage (23 °C for 7 days) and correlated with colour change and the activity of peroxidase/POD, ascorbic acid oxidase/AAO and lipoxygenase/LOX. Volatile organic compounds were monitored using PTR‐MS. Methanol had the highest concentration compared with other volatiles released in the headspace that significantly increased during senescence. The methanol concentration was approximately 500 ppbv before the broccoli colour began to change from green to yellow. The concentration of methanol in the headspace increased to 1000–1100 ppbv for Bellstar and Legacy when the colour became yellowish. LOX had high correlation (0.91 and 0.83 for Bellstar and Legacy, respectively) with volatiles for both cultivars, but not for POD. Methanol production is proposed as the best volatile marker to assess the broccoli quality.

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Section: Introductionmentioning

confidence: 97%

Monitoring colour, volatiles in the headspace and enzyme activity to assess the quality of broccoli florets (Brassica oleracea L. italica cv. Bellstar and Legacy) during postharvest storage

Raseetha

Oey

Burritt

et al. 2013

Int J of Food Sci Tech

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“…Different transduction modes can be used: amperometry [ 10 , 11 , 12 ] by the detection of NADH, capacitance [ 13 ], conductometry by the detection of the release of protons [ 14 ], or fluorimetry by detecting the autofluorescence of the coenzyme NADH [ 15 , 16 , 17 , 18 ]. As the sensors are miniaturized, the enzyme must be encapsulated in a hydrophilic film in order to keep it active.…”

Section: Introductionmentioning

confidence: 99%

A Sensitive Micro Conductometric Ethanol Sensor Based on an Alcohol Dehydrogenase-Gold Nanoparticle Chitosan Composite

et al. 2023

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In this paper, a microconductometric sensor has been designed, based on a chitosan composite including alcohol dehydrogenase—and its cofactor—and gold nanoparticles, and was calibrated by differential measurements in the headspace of aqueous solutions of ethanol. The role of gold nanoparticles (GNPs) was crucial in improving the analytical performance of the ethanol sensor in terms of response time, sensitivity, selectivity, and reproducibility. The response time was reduced to 10 s, compared to 21 s without GNPs. The sensitivity was 416 µS/cm (v/v%)−1 which is 11.3 times higher than without GNPs. The selectivity factor versus methanol was 8.3, three times higher than without GNPs. The relative standard deviation (RSD) obtained with the same sensor was 2%, whereas it was found to be 12% without GNPs. When the air from the operator’s mouth was analyzed just after rinsing with an antiseptic mouthwash, the ethanol content was very high (3.5 v/v%). The background level was reached only after rinsing with water.

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“…Phenothiazine derivatives belong to an extensively explored group of dyes due to their electrochemical and optical properties. Some phenothiazines have been used as redox mediators for biosensing [28][29][30], solar batteries [31,32] or fuel cells [33]. Some of them present an aromatic amine in their structure, which can be diazotized to generate a diazonium salt and then electrografted onto different materials.…”

Section: Introductionmentioning

confidence: 99%

Spectroelectrochemical operando method for monitoring a phenothiazine electrografting process on amide functionalized C-nanodots/Au hybrid electrodes

Martínez‐Periñán

Bravo

Mediavilla

et al. 2019

Electrochimica Acta

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Phenothiazine derivatives are extensively explored dye molecules, which present interesting electrochemical and optical properties. In recent years, the possibility of transforming some phenothiazines in their aryl diazonium salt derivatives has been proved, what allows them to be electrochemically reduced and electrografted onto conductive surfaces. This is a smart way to modify these surfaces and enable them with This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ 2 specific functionalities. In order to better comprehend the electrografting process and consequently have a higher control of it, in this work we have carried out an exhaustive study by operando UV-Vis spectroelectrochemistry of the electrografting of a phenothiazine aryl diazonium salt onto amide carbon nanodots. As a model of phenothiazine dye we have chosen Azure A. The electrografting onto carbon nanodots has been stablished by comparison with the results obtained on bare gold electrodes in this novel study. The presence of carbon dots improves the reversibility of the electrochemical process as derived from the results obtained by operando UV-Vis spectroelectrochemistry. In addition, to asses that the electrochemical process studied corresponds to the electrografting, the results have been compared to the those obtained for the simple Azure A adsorption. This study shows the advantages of obtaining simultaneously the electrochemical and the spectroscopic evolution of an electrontransfer process in a single experiment, in a particular electrochemical reaction. This work could be the starting point for the study of the electrografting on other nanomaterials.

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Amperometric enzyme electrodes for the determination of volatile alcohols in the headspace above fruit and vegetable juices

Cited by 9 publications

References 21 publications

Monitoring colour, volatiles in the headspace and enzyme activity to assess the quality of broccoli florets (Brassica oleracea L. italica cv. Bellstar and Legacy) during postharvest storage

Monitoring colour, volatiles in the headspace and enzyme activity to assess the quality of broccoli florets (Brassica oleracea L. italica cv. Bellstar and Legacy) during postharvest storage

A Sensitive Micro Conductometric Ethanol Sensor Based on an Alcohol Dehydrogenase-Gold Nanoparticle Chitosan Composite

Spectroelectrochemical operando method for monitoring a phenothiazine electrografting process on amide functionalized C-nanodots/Au hybrid electrodes

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